i am trying to make an ajax commenting system where if a new comment is posted, the document title changes to (1) website title (like twitter)

my code is here

The xmlHTTPrequest

 function loadXMLDoc7(url)

        {

        if (window.XMLHttpRequest)

          {// code for IE7+, Firefox, Chrome, Opera, Safari

          xmlhttp=new XMLHttpRequest();

          }

        else

          {// code for IE6, IE5

          xmlhttp=new ActiveXObject(Microsoft.XMLHTTP);

          }

        xmlhttp.open(GET,url,false);

        xmlhttp.send(null);

        document.getElementById('newcomments').innerHTML=xmlhttp.responseText;

        }

The PHP

    echo <script type='text/javascript'>

    function auto2comments()

    { 

    var MyDiv1 = document.getElementById('uiuiui');;

    echo loadXMLDoc7(MyDiv1.innerHTML);

    echo };

    echo setInterval(auto2comments(),15000);</script>;

    }

The DIV uiuiui contains /newcommentingi.php?show=0&id=username
The problem is when the Newcomments DIV gets filled, it shows

ID =

Show = 0

why?